I quit cleaning the brass anything short of just wiping it down. I use to tumble with walnut, then wet tumble with brass pins. In my experience I have seen very little benefit for my purposes in the cleaning of brass. My SD & ES are well within acceptable limits with SD in the teens and ES upper single digits to mid teens. I look at it as a ROTS dilemma, Return On Time Spent. How much time does it take to do the operation and does it return benefits I can't live without based on my shooting needs. I shoot 1K and hunt. YMMV